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arXiv 1902.09801gr-qcastro-ph.CO
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用广义相对论分析引力波

Analyzing Gravitational Waves with General Relativity

Luc Blanchet

摘要:

在简要回顾了引力波的重要性质和新兴的引力天文学之后,我们着重于理论方面。广义相对论中的解析近似方法在最近的引力波发现中起了至关重要的作用。它们被用来建立理论模板库,用于搜索和分析地基探测器LIGO和Virgo的信号,并进一步用于天基LISA类探测器。特别是,后牛顿近似描述了高精度的紧凑的双星系统,由黑洞或中子星的早期螺旋。它主要包括通过一系列相对论修正将爱因斯坦四极公式推广到高阶。紧凑的对象被建模的点质量与自旋。在实际计算中,由于采用了量纲正则化方法,发散问题得到了解决。在合并前的最后一次旋转中,中子星的有限尺寸效应和内部结构(特别是内部状态方程)影响轨道的演化和引力波的发射。我们在一个简单的牛顿模型中描述这些效应。

英文摘要:

After a short review of prominent properties of gravitational waves and the newly born gravitational astronomy, we focus on theoretical aspects. Analytic approximation methods in general relativity have played a crucial role in the recent discoveries of gravitational waves. They are used to build theoretical template banks for searching and analyzing the signals in the ground-based detectors LIGO and Virgo, and, further ahead, space-based LISA-like detectors. In particular, the post-Newtonian approximation describes with high accuracy the early inspiral of compact binary systems, made of black holes or neutron stars. It mainly consists of extending the Einstein quadrupole formula by a series of relativistic corrections up to high order. The compact objects are modelled by point masses with spins. The practical calculations face difficult problems of divergences, which have been solved thanks to the dimensional regularization. In the last rotations before the merger, the finite size effects and the internal structure of neutron stars (notably the internal equation of state) affect the evolution of the orbit and the emission of gravitational waves. We describe these effects within a simple Newtonian model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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